Brake-head connection.



INVENTOR l-sfleL 2.-

Patented Oct 3, 1916. 2 SHEETS-SHEET 1 .6. Nm mi. 8 N/ -Tn N04 vfnl-I 0R NA INM ROD UCE BDU. -A F LE .Hw TEW Mm DHI- Bw A T. L. BURTON.

BRAKE HEAD CONNECTION. ABPucATloN F|LEn^MAR.4,191e.

Patented Oct. 3,1916.

2 SHEETS-SHEET 2.'

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flanges o the brake head.

srafrns PATENT OFFICE. n

THOMAS L. BURTON, OF ST. LOUIS, MISSOURI, ASSIGNOR TO .-THE AMERICAN:BRAKE COMPANY, 0F ST. LOUIS, MISSOURI, A CORPORATION OF MISSOURI.

\ Bam-nm CONNECTION.

Specication of Letters Patent.

Patented oet. 3, 191e.

Original application led February 20, 1915, Serial No. 9,563. Dividedand this application illed Hatch .4,

1918. Serial No. 82,037.

To all whom zt may concern:

Be it lmown that I, THoMAs'L. BURTON, a citizen of the United States,residing at St. Louis,in the State of Missouri, have invented a certainnew and useful Improvement in Brake-Head Connections, of which imlprovement the following is a specification.

sition relative to the hanger until again shifted by engagement with thewheel. In the accompanying drawings: Figure 1 is a side elevation of abrake head and hanger showing one form of connection embodying myimprovement; Fig. 2, a transverse section of the same; Fig. 3, a sideelevation showing another modification; Fig. 4, a

transverse section ofthe same; and Figs.'

5 to 12 inclusive, similar sections showing other modifications.

It is important in the operation of railway brakes that the brake headsbe supported in such a manner that when the brakes are released allparts of the rubbing surfaces of the shoes are eectually prevented fromcoming into contact with the wheels, otherwise undesirable wear and lossof power would be occasioned. At the same time it is equally importantthat when the brakes are applied, the shoes be permitted to so adjustthemselves relatively to the wheels that the rubbing surfaces of theshoes become concentric with the wheels, thus providing forsubstantially uniform pressure and wear on all parts of the rubbingsurfaces of the shoes.

According to the construction shown in Figs. 1 and 2 of the drawings,the brake head, 1, carrying the shoe, 2, is pivotally mounted on thehanger, 3, by means of a pin, 4, passin through the han er and the twoccording to my improvement, one of the supporting anges of the brakehead is provided with an open-- ing in which is mounted a longitudinallymovable bushing, 5, on the connecting pin, 4, while a spring andclamping nut on the pin serve to exerts'. pressure and. produce acorresponding frictional resistance between said bushing and the hanger,and between the hanger and one of the brake head flanges. As shown inFigs. 1 and 2, the movable bushing, 5, is of hexagonal or othernon-clrcular form, and contains a recess for the -head of the pin orbolt, 4, so that ltlhedbushing and bolt turn with the brake The hanger,3, is provided with friction surfaces upon its opposite sides around thebolt opening for engaging a corresponding ace on the bushing on one sideand on the other brake head ilange on the other side, these parts beingpressed against each other by the spring, 6, which is mounted on thebolt outside of one of the brake head flanges and bears at its outer endagainst the washer, 7, held by the nut, 8, on the bolt. The .force ofthe spring holds the friction faces 1n contact with suilicient pressureto maintain the same relative position between the brake shoe and hangerwhen the brake is released as when applied to the wheel. In this way allparts of the rubbing surface of the shoe are eii'ectually prevented fromcoming into contact with the wheel when the brake is released, and atthe same time the .shoe is permitted to readily so adjust itselfrelatively to the wheel that the rubbing surface of the shoe becomesconcentric with the wheel when the brake is applied, for as soon as anywear of other cause tends to disturb this relation, the application ofthe shoe to the ,wheel will force the head to turn slightly on its pivotpin on the hanger and sufficiently to reestablish the concentricrelation above referred to. The frictional engagement between thesurfaces of the brake head and the movable bushing and the correspondingsurfaces on the hanger will then hold rthe parts in this position untilfurther adjustment is made.

According to the modification shown in Figs. 3 and 4, the longitudinallymovable bushing, 5, is cylindrical, and is mounted in the flange of thehead on the same side as the spring. In this case, the bushing may turnwith the hanger and relatively to the nut, 8, which is constrained toample the washer, 7, or between the washer and the the brake head. anycase there is the frictionall resistance to the motion of the; .hangerrelatively to the brake head of the serves both as the longitudinalmovable bushing and as the spring, and bears d1- rectly upon thefriction face at one side of the hanger, passing through the enlargedcylindrical opening in the' flange of the i brake head.

According to Fig. 6, the spring, 6, is dispensedwith, and in lieuthereof, a spring Washer, 9, is used under the head of the bolt, 4.

In Figs. 3-to 6 inclusive, it is apparent -that the frictionalengagement with the left side of the hanger 1s not a positive one, forif the head is rotated relatively to the hanger, the bushing, 58,-or itsequivalent, 5", will rotate with the hanger, ceiling or uncoiling thespring about its central'am'suntil the torsional resistance of thespring becomes suicient to prevent its further distortion; then when theforce which occasioned the rotation of the head ceases to be exerted onit, the tendency of the spring to recoil will continue to cause a forceto act on the head tending to restore the head to its original positionrelative to the hanger.

In order to maintain the same relative position between the brake headand hanger when'the brake is released as when applied, it is importantthat the frictional engagements on which the maintenance ofthis-relation depends be positive in their action and free at all timesfrom any tendency to cause rotation of the head relatively to thehanger. y

In Fig. 7 it will be noted that the construction is similar to that ofFigs. 3 and 4, with the exception that the bushing, 5, is prevented fromrotating relatively' to the brake head by means of the key, 10, and thebolt, 4, the head of which is lodged in a recess in one of the sideflanges. In Fig. 8,-

the bushing, 5, is prevented from rotating relatively to the the key,10a, engaging with the left-hand side angc. It will be observed that inboth of these figures means are provided for formin two positivefrictional engagements with t e surfaces of the hanger, each of which isadapted to-unformly op ose the rotation of the brake head relative y tothe hanger.

The constructions shown in Figs. 9 and 10 are substantially the same asthose of Figs.

1 and 2, with the exception that instead of the bushing, 5, the boltitself is adapted to turn with.

brake head cby means of nieder/i and also to have frictional engagementwith the face of the hanger. In Fig. 9 the *bolt i is provided with anenlargement or collar, 4, and in Fig. 10 the head of the bolt itseli isextended to perform the functions in question. In both cases the bolt isprevented from rotating relatively to the brake head ,by means of ahexagonal recess in the slde flange which engages the bolt head.

In Fig. 11, a bushing, 5a, rotatable relatively to the brake head ismounted on the bolt, 4, within the left side flange. The bolt, 4, isnon-rotatably connected with the hanger bymeans of the key, 12, and theheado the bolt is adapted to have frictional engagement with the outersurface of the right-hand side liange. The object of this constructionis to provide positive frictional engagements with theV inner and outersurfaces of one of the side anges.

In Fig. 12, the bushing, 5, which is rotatable relatively to the brakehead is mounted .on the bolt, 4, `Within one of the side lianges, also awasher, 11, is mounted on the bolt, 4, outside of the-.other side flangeand is prevented from rotating relatively to the bolt by means ofthekey, 10. 4A key, 12, connects the bolt, 4, with the hanger, 3, so thatthese parts cannot rotate relatively to each other. It is apparent'thatthe spring,

6, presses the washer, 11, and the hanger, 3,

into frictional enga, g"emen t with the opposite faces of one of theside flanges, also that both of these engagements are of a positivecharacter, for when the -hanger is rotated relatively to the brake head,the bolt, 4, and Washer, 11, must turn with it. It will be obvious that,if preferred, the bushing may be integral with .the bolt.

This application is a division of my prior application Serial No. 9563,filed February Y ing side flanges, a hanger between said flangesandrotatable relatively thereto, and means for forming a plurality ofrictional engagements with the surfaces Vof the side Hanges to opposetherotation of the brake head relatively to the hanger. l. 3. Thecombination4 of abrake head having side Bauges, a hanger between saidflanges, and means for causing a rictional engagement between thesurface of said hanger and one of the side Hanges.

4. 'Ihe combination of 'a brake head hav-l ing side flanges, a hangerbetween said flanges, a bolt passing through the same, a bushing mountedon said' bolt withinl the opening in one of the side flanges, and meansfor pressing the bushing Aand one of said flanges into frictionalengagement with the hanger.

5. The combination of a brake head having side flanges, a hanger betweensaid flanges, a bolt passing through the same, a bushing mounted on saidbolt within the opening in one of the side flanges, and a spring mountedon said bolt outside of said flanges for forcing the bushing and oneflange into frictional engagement with the hanger.

6. The combination of a brake head having vside flanges, a hangerbetween said flanges, a bolt passing through the same, a bushing mountedon said bolt within the opening in one of said side flanges, andconnected with the brake head, and a spring on said bolt for forcing theparts into frictional engagement with each other.

7. The combination of a brake head having side flanges, a hanger betweensaid flanges, a bolt passing through the same, a longitudinally movablebushing mounted on said bolt within the opening of one of the sideflanges, and means for pressing the bushing and one of said flanges intofrictional engagement with the hanger.

8. The combination of a brake head having side flanges, a hanger betweensaid flanges, a bolt passing through thev same, a longitudinally movablebushing mounted on said bolt within the opening in one of the sideflanges, and a sprmg mounted on said bolt outside of said flanges forforcing the bushing and one flange into frictional engagement with thehanger.

9. The combination of a brake head having side flanges, a hanger betweensaid flanges, a boltfpassing through the same, a slidable bushingmounted on said bolt within the opening in one of the side flanges, andconnected with the brake head, and a spring on said bolt for forcing theparts into frictional engagement with each other.

bushing for the bolt head, and a spring on the other end of the bolt forforcing the bushing and one of the flanges into frictional engagementwith the hanger.

11. The combination of'a brake head having side flanges, a hangerbetween said flanges, a bolt passing through the same, a bushing mountedon said bolt within the opening in one of the side flanges, andconnected with the brake head, and means for forcing the bushing and oneof the side flanges into frictional engagement with the hanger.

12. The combination of a brake head having side flanges, a hangerbetween said flanges, a .bolt passing through the same, means adapted toform a bearing for one of the brake head flanges mounted on said bolt onone side of the hanger, and having en-l gagement therewith, anon-rotatable member connected with the bolt on the opposite side of thehanger, and having frictional engagement with the other side flange, andmeans for preventing the bolt from rotating `relatively to the hanger.

13. The combination of a brake head having side flanges, a hangerbetween said flanges, a bolt; passing through the same, means adapted toform a bearing for one of the brake head flanges mounted on said bolt onone side of the hanger, and having engagement therewith, a non-rotatablemember connected with the bolt on the opposite side of the hanger, meansfor preventing the bolt from rotating relatively to the hanger, andmeans for forcing the hanger and said non-rotatable memberconnected withthe bolt into frictional engagement with'the brake head.

In testimony whereof I have hereunto set my hand.

THOMAS L. BURTON.

